隧道活塞风速计算方法及其影响因素分析

针对隧道内活塞风会对安全门和广告灯箱等引起破坏的问题，开展了地铁单线无风井和有风井两种形式的隧道空气动力学特性分析，建立了隧道各断面之间的一维伯努利方程和流体连续性方程，研究了不同形式隧道下活塞风速的理论计算模型. 并使用SES软件建立其仿真模型对计算模型的结果进行验证， 重点研究了对活塞风速影响的主要因素.结果表明:隧道内活塞风速与列车速度、列车长度和列车外表面光洁度等成正比例关系，而活塞风井高度、断面面积和风井位置等参数对活塞风速影响不大.所提出的计算模型可用于实际工程中活塞风速的简便计算.

Piston Wind Speed Calculation Method and Analysis of Influence Factors for Subway Tunnel

To avoid damages by the piston wind to the safty doors and AD light boxes in subway tunnels， the aerodynamic characteristics of subway tunnel with and without shaft were analyzed， one-dimensional Bernoulli equations and fluid continuity equations between tunnel sections were established， the numerical calculation model of the piston wind under different tunnels were analyzed， the simulation model established by SES software and calculation model results were also verified. The principal factors affecting the piston wind speed are studied. The results show that the piston wind speed is proportional to the train speed， the length of the train and the smoothness of the train surface. The height， the section area and the position of the air shaft have little effect toward the piston wind speed. The proposed numerical calculation model can be used for the simple calculation of the piston wind speed in actual projects.